第766天 cost 作名词

• cost 作为名词，表示 价格，成本，费用

The cost of bread has increased.
面包的价格已经上涨了。
The cost of living is much higher now than it was two years ago.
现在的生活成本比两年前高得多。
The total cost of this picnic was about 200 yuan.
这次野餐的全部费用大约200元。

短语：

1. at all costs 意为 无论如何，不惜任何代价
   I must get this book at all costs.
   无论如何，我必须得到这本书。
2. at the cost of sth. 意为 以牺牲某事物为代价
   She saved her little brother at the cost of her own life.
   她以牺牲自己的性命为代价，救回了弟弟。